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Investigating strong ground-motion variability using analysis of variance and two-way-fit plots

机译:使用方差分析和双向拟合图研究强烈的地面运动变异性

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摘要

A statistical method to quantitatively assess the relative importance of unmodelled site and source effects on the observed variability (sigma) in ground motions is presented. The method consists of analysis of variance (ANOVA) using the computed residuals with respect to an empirical ground-motion model for strong-motion records of various earthquakes recorded at a common set of stations. ANOVA divides the overall variance (sigma(2)) into the components due to site and source effects (respectively sigma(2)(S) and sigma(E) (2)) not modelled by the ground-motion model plus the residual variance not explained by these effects (sigma(2)(R)). To test this procedure, four sets of observed strong-motion records: two from Italy (Umbria-Marche and Molise), one from the French Antilles and one from Turkey, are used. It is found that for the data from Italy, the vast majority of the observed variance is attributable to unmodelled site effects. In contrast, the variation in ground motions in the French Antilles and Turkey data is largely attributable, especially at short periods, to source effects not modelled by the ground-motion estimation equations used.
机译:介绍了一种统计方法,用于定量评估未建模的站点和源对地面运动中观测到的变异性(sigma)的相对重要性。该方法由方差分析(ANOVA)组成,使用方差分析(ANOVA)来计算经验性地面运动模型,该模型用于在一组公共站点记录的各种地震的强运动记录。方差分析将总方差(sigma(2))归因于场地和源效应(分别为sigma(2)(S)和sigma(E)(2))而不是由地面运动模型加上残余方差建模的分量这些效果无法解释(sigma(2)(R))。为了测试此过程,使用了四组观察到的强运动记录:两套来自意大利(翁布里亚-马尔什和莫利塞),一套来自法国安的列斯群岛,另一套来自土耳其。结果发现,对于来自意大利的数据,观察到的绝大多数差异都归因于未建模的场地效应。相比之下,法国的安的列斯群岛和土耳其的数据中地震动的变化在很大程度上归因于源效应,尤其是在短时期内,该源效应不是由所使用的地震动估算方程来模拟的。

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